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package de.danoeh.antennapod.view;
import android.content.Context;
import android.content.SharedPreferences;
import android.util.AttributeSet;
import android.view.View;
import androidx.appcompat.view.ContextThemeWrapper;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.yqritc.recyclerviewflexibledivider.HorizontalDividerItemDecoration;
import de.danoeh.antennapod.R;
import io.reactivex.annotations.Nullable;
public class EpisodeItemListRecyclerView extends RecyclerView {
private static final String TAG = "EpisodeItemListRecyclerView";
private static final String PREF_PREFIX_SCROLL_POSITION = "scroll_position_";
private static final String PREF_PREFIX_SCROLL_OFFSET = "scroll_offset_";
private LinearLayoutManager layoutManager;
public EpisodeItemListRecyclerView(Context context) {
super(new ContextThemeWrapper(context, R.style.FastScrollRecyclerView));
setup();
}
public EpisodeItemListRecyclerView(Context context, @Nullable AttributeSet attrs) {
super(new ContextThemeWrapper(context, R.style.FastScrollRecyclerView), attrs);
setup();
}
public EpisodeItemListRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(new ContextThemeWrapper(context, R.style.FastScrollRecyclerView), attrs, defStyleAttr);
setup();
}
private void setup() {
layoutManager = new LinearLayoutManager(getContext());
layoutManager.setRecycleChildrenOnDetach(true);
setLayoutManager(layoutManager);
setHasFixedSize(true);
addItemDecoration(new HorizontalDividerItemDecoration.Builder(getContext()).build());
}
public void saveScrollPosition(String tag) {
int firstItem = layoutManager.findFirstVisibleItemPosition();
View firstItemView = layoutManager.findViewByPosition(firstItem);
float topOffset;
if (firstItemView == null) {
topOffset = 0;
} else {
topOffset = firstItemView.getTop();
}
getContext().getSharedPreferences(TAG, Context.MODE_PRIVATE).edit()
.putInt(PREF_PREFIX_SCROLL_POSITION + tag, firstItem)
.putInt(PREF_PREFIX_SCROLL_OFFSET + tag, (int) topOffset)
.apply();
}
public void restoreScrollPosition(String tag) {
SharedPreferences prefs = getContext().getSharedPreferences(TAG, Context.MODE_PRIVATE);
int position = prefs.getInt(PREF_PREFIX_SCROLL_POSITION + tag, 0);
int offset = prefs.getInt(PREF_PREFIX_SCROLL_OFFSET + tag, 0);
if (position > 0 || offset > 0) {
layoutManager.scrollToPositionWithOffset(position, offset);
}
}
public boolean isScrolledToBottom() {
int visibleEpisodeCount = getChildCount();
int totalEpisodeCount = layoutManager.getItemCount();
int firstVisibleEpisode = layoutManager.findFirstVisibleItemPosition();
return (totalEpisodeCount - visibleEpisodeCount) <= (firstVisibleEpisode + 3);
}
}
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